Scrubgrass Power Generating Company
Ventigo County, Pennsylvania
 For
Scrubgrass Power Generating Company, Roberts & Schaefer provided
engineering, procurement, and construction of a limestone storage
and reclaim and processing facility in Ventigo County, Pennsylvania.
Limits on on-site work required major off-site pre-assembly and
fabrication. Despite these constraints, R&S completed the
project in about 14 months, from the day of award to mill commissioning.
R&S supplied an enclosed limestone dump barn, designed to
handle both rear dump and bottom dump units. Limestone is stored
in 30-ton hoppers, fitted with a protective grizzly and a manual
shutoff gate, and reclaimed at 80 TPH by a vibrating feeder. The
feeder discharges into a bucket elevator for delivery to the 100-ton
storage bin.
The surge bin is fitted with twin discharge outlets, each of
which has a manual cutoff gate. Each outlet has a 30 TPH vibrating
mill feeder to reclaim the 1.75 inch x 0 limestone to 30 TPH Bradley
air swept mills. Each Bradley has air locks and rotary vane feeders.
The secondary bag houses are also independent, and each cyclone
has a bag house. The product from the two cyclones and the two
bag houses collects in a common pneumatic line, which runs along
the existing conveyor route to the boiler block. From there, it
moves to the limestone storage silo.
R&S provided a fugitive dust collection system at the dump
bin crushing station and at the storage silo. R&S also installed
all electrical facilities and tie-in to the owner's DCS system.
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